media: Make parameter of media_entity_remote_pad() const

The local pad parameter in media_entity_remote_pad() is not modified.
Make that explicit by adding a const modifier.

Signed-off-by: Todor Tomov <[e-mail]>
Acked-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/media-entity.c

···
 }
 EXPORT_SYMBOL_GPL(media_entity_find_link);
 
-struct media_pad *media_entity_remote_pad(struct media_pad *pad)
+struct media_pad *media_entity_remote_pad(const struct media_pad *pad)
 {
 	struct media_link *link;
 

include/media/media-entity.h

···
  * Return: returns a pointer to the pad at the remote end of the first found
  * enabled link, or %NULL if no enabled link has been found.
  */
-struct media_pad *media_entity_remote_pad(struct media_pad *pad);
+struct media_pad *media_entity_remote_pad(const struct media_pad *pad);
 
 /**
  * media_entity_get - Get a reference to the parent module